Facebook reaction buttons are new feature on facebook released to add more reaction from the previous normal popular like button.
Apart from the normal like button, facebook added five more reaction buttons: Love, Haha, Wow, Sad and Angry
How to use facebook reaction emojis
Facebook Reaction button is now available to all countries for both Android and iOS Facebook application users. To use reaction button you need to go to facebook status that you want to react on, hover on the old like button and you will find the other reaction buttons popping up. Click on the the button you want, your done.